A093401 - OEIS

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A093401

Primes of the form 20*R_n + 9, where R_n is the repunit (A002275) of length n.

29, 229, 22229, 22222222222229 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	COMMENTS	`a(5) has 176 digits, a(6) has 416 digits. [Vincenzo Librandi, Dec 10 2010; Bruno Berselli, Jul 17 2012]`
	LINKS	`Table of n, a(n) for n=1..4.`
	CROSSREFS	`Cf. A056678 (corresponding n).` `Sequence in context: A142066 A091631 A146421 * A042636 A091630 A027112` `Adjacent sequences: A093398 A093399 A093400 * A093402 A093403 A093404`
	KEYWORD	`nonn`
	AUTHOR	`Rick L. Shepherd, Mar 28 2004`
	STATUS	`approved`

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Last modified June 19 19:50 EDT 2013. Contains 226416 sequences.